VkPhysicalDeviceRayTracingPropertiesNV

The VkPhysicalDeviceRayTracingPropertiesNV structure is defined as:

typedef struct VkPhysicalDeviceRayTracingPropertiesNV {
    VkStructureType sType;
    void* pNext;
    uint32_t shaderGroupHandleSize;
    uint32_t maxRecursionDepth;
    uint32_t maxShaderGroupStride;
    uint32_t shaderGroupBaseAlignment;
    uint64_t maxGeometryCount;
    uint64_t maxInstanceCount;
    uint64_t maxTriangleCount;
    uint32_t maxDescriptorSetAccelerationStructures;
} VkPhysicalDeviceRayTracingPropertiesNV;

• sType is a VkStructureType value identifying this structure.
• pNext is NULL or a pointer to a structure extending this structure.
• shaderGroupHandleSize is the size in bytes of the shader header.
• maxRecursionDepth is the maximum number of levels of recursion allowed in a trace command.
• maxShaderGroupStride is the maximum stride in bytes allowed between shader groups in the shader binding table.
• shaderGroupBaseAlignment is the required alignment in bytes for the base of the shader binding table.
• maxGeometryCount is the maximum number of geometries in the bottom level acceleration structure.
• maxInstanceCount is the maximum number of instances in the top level acceleration structure.
• maxTriangleCount is the maximum number of triangles in all geometries in the bottom level acceleration structure.
• maxDescriptorSetAccelerationStructures is the maximum number of acceleration structure descriptors that are allowed in a descriptor set.

Due to the fact that the geometry, instance, and triangle counts are specified at acceleration structure creation as 32-bit values, maxGeometryCount, maxInstanceCount, and maxTriangleCountmust not exceed 2³²-1.

If the VkPhysicalDeviceRayTracingPropertiesNV structure is included in the pNext chain of the VkPhysicalDeviceProperties2 structure passed to vkGetPhysicalDeviceProperties2, it is filled in with each corresponding implementation-dependent property.

Limits specified by this structure must match those specified with the same name in VkPhysicalDeviceAccelerationStructurePropertiesKHR and VkPhysicalDeviceRayTracingPipelinePropertiesKHR.